Well I remember having one or two through my 20's and into my early 30's but now days I don't even wake up with morning wood anymore. So sad that the body just goes down hill. At least it will still respond if you "talk to it" with the right sort of lip service.
I still get erotic dreams, and morning wood, but they aren't associated with ejaculation anymore. That stopped in my fifties, I think.
The question has got me wondering if celibate people who don't masturbate (such as some clerics and monks) get wet dreams from time to time. Or does that all disappear? I don't suppose there are a lot of clerics here on the board that could answer the question.